| <!DOCTYPE html> |
| <html> |
| <body> |
| <canvas id ='output' width='150' height='150'></canvas> |
| <script> |
| var aCanvas = document.getElementById('output'); |
| var ctx = aCanvas.getContext('2d'); |
| |
| var patternCanvas = document.createElement('canvas'); |
| patternCanvas.width = 30; |
| patternCanvas.height = 30; |
| var patternCtx = patternCanvas.getContext('2d'); |
| patternCtx.fillStyle = '#f00'; |
| patternCtx.fillRect(0, 0, 15, 15); |
| patternCtx.fillStyle = '#0f0'; |
| patternCtx.fillRect(15, 0, 15, 15); |
| patternCtx.fillStyle = '#00f'; |
| patternCtx.fillRect(0, 15, 15, 15); |
| patternCtx.fillStyle = "#ff0"; |
| patternCtx.fillRect(15, 15, 15, 15); |
| |
| ctx.drawImage(patternCanvas, 0, 0); |
| ctx.drawImage(patternCanvas, 30, 30); |
| // stretch the image |
| ctx.drawImage(patternCanvas, 8, 8, 15, 15, 60, 60, 60, 60); |
| // reduce the image |
| ctx.drawImage(patternCanvas, 8, 8, 15, 15, 120, 120, 15, 15); |
| </script> |
| </body> |
| </html> |
